A 52-year-old male presented with a headache for 1 week. The headache was mainly located in the occipital area with paroxysmal onset. A nervous system physical examination showed that Kernig’s sign was suspiciously positive, while no other positive signs were observed. Blood tests showed elevated C-reactive protein (CRP, 37.1 mg/L).
However, (MRI) of the brain did not show any abnormalities. Notably, thyroid-stimulating hormone receptor antibody (TRAb), thyroid peroxidase antibody (TPOAb), and thyroglobulin antibody (TGAb) were all negative. Further examination of thyroid color ultrasound showed bilateral diffuse hypoechoic areas. A subsequent thyroid examination was conducted, which revealed mild tenderness, specifically in the left thyroid.
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